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  • A search for the dimuon dec...
    Agapopoulou, C.; Aggarwal, A.; Anastopoulos, C.; Andari, N.; Angelidakis, S.; Assamagan, K.; Augsten, K.; Babal, D.; Bagnaia, P.; Bernlochner, F.U.; Bhopatkar, V.S.; Biswas, D.; Büscher, V.; Calvet, T.P.; Carney, R.M.D.; Caron, S.; Castro, N.F.; Cattai, A.; Coimbra, A.E.C.; Collot, J.; Cunningham, W.R.; Da Fonseca Pinto, J.V.; Della Volpe, D.; Djama, F.; Dolejsi, J.; Dova, M.T.; Fleischmann, P.; Follega, F.M.; García Pascual, J.A.; Garonne, V.; Gee, C.N.P.; Goncalves Gama, R.; Gorasia, N.A.; Gramling, J.; Guescini, F.; Haaland, E.S.; Han, L.; Hansen, P.H.; Hawkings, R.J.; Hopkins, W.H.; Hubaut, F.; Ilic, N.; Jakobs, K.; Kaji, T.; Karyukhin, A.N.; Katzy, J.; Kluth, S.; Kondo, T.; Kortner, O.; Kourkoumelis, C.; Kretzschmar, J.; Kuchinskaia, O.; Lapertosa, A.; Lindon, J.H.; Liu, M.; Lleres, A.; Longarini, I.; Lorenz, J.; Lory, A.M.; Lu, Y.J.; Madugoda Ralalage Don, M.; Mergelmeyer, S.; Metcalfe, J.; Milstead, D.A.; Miucci, A.; Morvaj, L.; Moskvitina, P.; Negrini, M.; Nelson, M.E.; O'neill, A.P.; Ouellette, J.; Pauly, T.; Pietreanu, D.; Pospisil, S.; Prades Ibanez, A.; Proklova, N.; Rijssenbeek, M.; Roggel, J.; Rosser, B.J.; Sankey, D.P.C.; Sano, Y.; Scheirich, D.; Schernau, M.; Schmitt, C.; Shen, Y.; Smirnov, N.; Smirnov, S.Yu; Ströhmer, R.; Tu, Y.; Ukegawa, F.; Ungaro, F.C.; Vuillermet, R.; Walder, J.; Williams, D.M.; Wolters, H.; Yang, Y.; Yuan, R.; Zambito, S.; Zhou, M.S.; Zoch, K.

    Physics letters. B, 2021, Letnik: 812
    Journal Article

    A search for the dimuon decay of the Standard Model (SM) Higgs boson is performed using data corresponding to an integrated luminosity of 139 fb−1 collected with the ATLAS detector in Run 2 pp collisions at s=13 TeV at the Large Hadron Collider. The observed (expected) significance over the background-only hypothesis for a Higgs boson with a mass of 125.09 GeV is 2.0σ (1.7σ). The observed upper limit on the cross section times branching ratio for pp→H→μμ is 2.2 times the SM prediction at 95% confidence level, while the expected limit on a H→μμ signal assuming the absence (presence) of a SM signal is 1.1 (2.0). The best-fit value of the signal strength parameter, defined as the ratio of the observed signal yield to the one expected in the SM, is μ=1.2±0.6.